The shaman sends his mind winging into the wilds and possesses the largest creature he can find, storming back onto the battlefield with a vengeance.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Savage Dominion is an augment spell that is cast on the Wizard itself. The Wizard may summon one of the following Monsters: Ghorgon, Jabberslythe or Chaos Giant. Immediately place a model representing the beast, with its base touching any table edge. This model is effectively part of the Beastman army from that moment on. Every time the beast suffers a wound, the Wizard that summoned it must make a Toughness test. If this is failed, the Wizard takes a wound too, with no saves of any kind possible. If the Wizard is killed, the beast wanders back into the forest and is immediately removed from play (it counts as being killed for the purposes of victory conditions etc.). Note that the beast cannot be voluntarily dismissed by the Wizard, or dispelled by the enemy in following rounds. In addition, only one monster may be summoned by the same Wizard at any one time.